TABLE 3.
Intratrial mean serum 25(OH)D concentration by race and BMI
| Race category | n (%) | Mean intratrial serum 25(OH)D, ng/mL ± SD1 | Vitamin D categories, n (%) |
|||
|---|---|---|---|---|---|---|
| <20 ng/mL (<50 nmol/L) | 20 to <30 ng/mL (50-74 nmol/L) | 30 to <40 ng/mL (75-99 nmol/L) | ≥40 ng/mL (≥100 nmol/L) | |||
| Asian | 117 | 16 (13.7) | 21 (17.9) | 35 (29.9) | 45 (38.5)2 | |
| 35.8 ± 13.8 3 | 14.3 ± 3.5 | 24.7 ± 2.9 | 34 ± 2.8 | 50 ± 7.2 | ||
| BMI,4kg/m2 | ||||||
| <25 | 21 (17.9) | 36.2 ± 12.4 | 3 (14.3) | 3 (14.3) | 8 (38.1) | 7 (33.3) |
| 25 to <30 | 64 (54.7) | 37.4 ± 14.2 | 7 (10.9) | 10 (15.6) | 20 (31.3) | 27 (42.2) |
| 30 to <35 | 28 (23.9) | 31.2 ± 13.8 | 6 (21.4) | 8 (28.6) | 5 (17.9) | 9 (32.1) |
| ≥35 | 4 (3.4) | 40.1 ± 8.8 | 0 (0) | 0 (0) | 2 (50.0) | 2 (50.0) |
| Black | 530 | 125 (23.6) | 121 (22.8) | 111 (20.9) | 173 (32.6)2 | |
| 33.7 ± 16.23 | 15 ± 3.4 | 24.8 ± 2.8 | 34.8 ± 2.6 | 52.7 ± 10.6 | ||
| BMI,4kg/m2 | ||||||
| <30 | 161 (30.4) | 37.1 ± 17.8 | 32 (19.9) | 33 (20.5) | 31 (19.3) | 65 (40.4) |
| 30 to <35 | 208 (39.2) | 32.8 ± 15.6 | 46 (22.1) | 57 (27.4) | 43 (20.7) | 62 (29.8) |
| 35 to <40 | 124 (23.4) | 31.9 ± 15.5 | 36 (29.0) | 22 (17.7) | 29 (23.4) | 37 (29.8) |
| ≥40 | 37 (7.0) | 29.4 ± 11.4 | 11 (29.7) | 9 (24.3) | 8 (21.6) | 9 (24.3) |
| White | 1455 | 100 (6.9) | 302 (20.8) | 424 (29.1) | 629 (43.2)2 | |
| 39.2 ± 14.43 | 16 ± 3 | 25.5 ± 2.9 | 34.6 ± 2.9 | 52.6 ± 10 | ||
| BMI,4kg/m2 | ||||||
| <30 | 519 (35.7) | 42.1 ± 14.7 | 19 (3.7) | 89 (17.1) | 153 (29.5) | 258 (49.7) |
| 30 to <35 | 546 (37.5) | 39.2 ± 14.0 | 27 (4.9) | 129 (23.6) | 154 (28.2) | 236 (43.2) |
| 35 to <40 | 314 (21.6) | 36.0 ± 13.7 | 37 (11.8) | 71 (22.6) | 95 (30.3) | 111 (35.4) |
| ≥40 | 76 (5.2) | 34.0 ± 14.1 | 17 (22.4) | 13 (17.1) | 22 (28.9) | 24 (31.6) |
Plus or minus values are mean ± SD. Percentages may not add up to 100 because of rounding off.
Row percentages add up to 100.
1
To convert 25-hydroxyvitamin D from ng/mL to nmol/L, multiply by 2.496.
2
Chi-squared test comparing % of participants of each race group achieving an intratrial mean 25(OH)D ≥ 40 ng/L, P < 0.01.
3
ANOVA test comparing intratrial mean 25(OH)D concentrations between all 3 race groups, P < 0.001.
4
Ordinary least square regression P < 0.001, significant overall trend pf 25(OH)D concentrations for weight groups adjusted for race.